Siemens P140 - 40 A, 1-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Siemens P140 — a dependable 40A, 1-pole bolt-on molded case circuit breaker engineered for reliable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to stay secure under vibration, it delivers consistent protection where it matters most, from residential panels to light commercial installations.

Why this P140 matters for your electrical system

• Secure bolt-on mounting: rigid, vibration-resistant bus connections help maintain electrical integrity even in demanding environments.
• Thermal-magnetic trip unit: provides stable, repeatable protection by reacting to both overloads and short circuits, reducing nuisance trips and ensuring reliable circuit safety.
• OEM-compatible: designed to pair with matching Siemens OEM load centers and panelboards for seamless integration and dependable performance.
• Versatile applications: suitable for residential, commercial, and light industrial circuits where dependable protection is essential.

What it does for your electrical system

The Siemens P140 acts as a safeguard for branch circuits, automatically interrupting power flow when overcurrent or short-circuit conditions are detected. With a 40-amp rating and 1-pole design, it protects individual circuits while fitting neatly into compatible panelboards, helping to prevent equipment damage and reduce the risk of electrical fires.

Technical snapshot

• Manufacturer: Siemens
• Part Number: P140
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios and practical tips

Perfect for upgrading or expanding panels in residential settings, or coordinating protection for light commercial loads such as lighting, small HVAC controls, and powered equipment. When selecting a breaker, ensure your panelboard is designed for bolt-on, 1-pole devices and that the P140’s 40A rating aligns with the protected circuit’s conductor size and load requirements. For installation, follow standard electrical code practices and your panelboard manufacturer’s guidelines to ensure proper mounting and secure connection to the bus bars.

Whether you’re stocking a repair-ready fleet for AmpState customers or tailoring a panel for a new build, the Siemens P140 delivers dependable, well-proven protection with a focus on reliability and ease of integration. Its balance of precise thermal-magnetic protection and robust mounting makes it a practical choice for keeping circuits safe across a range of settings.